28518081 has 16 divisors (see below), whose sum is σ = 39334464. Its totient is φ = 18368064.

The previous prime is 28518079. The next prime is 28518103. The reversal of 28518081 is 18081582.

It is not a de Polignac number, because 28518081 - 2¹ = 28518079 is a prime.

It is a super-2 number, since 2×28518081² = 1626561887845122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28518071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9315 + ... + 11991.

It is an arithmetic number, because the mean of its divisors is an integer number (2458404).

Almost surely, 2^28518081 is an apocalyptic number.

It is an amenable number.

28518081 is a deficient number, since it is larger than the sum of its proper divisors (10816383).

28518081 is a wasteful number, since it uses less digits than its factorization.

28518081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 28518081 is about 5340.2322983181. The cubic root of 28518081 is about 305.5203194091.

The spelling of 28518081 in words is "twenty-eight million, five hundred eighteen thousand, eighty-one".